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Dynamics of spin-orbital-angular-momentum coupled Bose-Einstein condensates on a ring |
| Lin Wen(文林)1, Yi-Han Huang(黄燚寒)1, Lei Zhao(赵磊)1, Xu Qiu(邱旭)1,2,†, and Ming-Yue Yang(杨明月)3,‡ |
1 College of Physics and Optoelectronic Engineering, Chongqing Normal University, Chongqing 401331, China;
2 College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China;
3 Department of Physics, Capital Normal University, Beijing 100048, China |
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Abstract We investigate the dynamics of a two-component Bose-Einstein condensate subject to spin-orbital-angular-momentum coupling and confined to a ring, via the variational approach. Adopting a single-mode approximation by assuming that the BEC carries a single angular momentum for SU(2)-symmetric spin interactions, the equations of motion for the variational parameters are derived. The phase diagram of the ground state in the plane of the Raman coupling and detuning contains three different phases which meet at a tricritical point, and the exact phase boundaries between the three phases are determined. Linear stability analysis shows that the stationary state is dynamically stable, and there exists an oscillation eigenmode with frequency determined by detuning, angular momentum, and Raman coupling. The time-evolution results indicate that the spin vector undergoes periodic rotation along a closed orbit on the Bloch sphere, which can be interpreted as a precession of the collective spin around an effective field determined by the Raman coupling strength, the detuning, and the angular momentum.
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Received: 04 February 2026
Revised: 16 March 2026
Accepted manuscript online: 03 April 2026
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PACS:
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03.75.Mn
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(Multicomponent condensates; spinor condensates)
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37.10.Vz
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(Mechanical effects of light on atoms, molecules, and ions)
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67.85.-d
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(Ultracold gases, trapped gases)
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| Fund: Project by the National Natural Science Foundation of China (Grant Nos. 12175027 and 11875010), the Natural Science Foundation of Chongqing (Grant No. CSTB2025NSCQGPX1010), and the Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN202500531). |
Corresponding Authors:
Xu Qiu, Ming-Yue Yang
E-mail: xuqiu@cqnu.edu.edu;2220601001@cnu.edu.cn
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Cite this article:
Lin Wen(文林), Yi-Han Huang(黄燚寒), Lei Zhao(赵磊), Xu Qiu(邱旭), and Ming-Yue Yang(杨明月) Dynamics of spin-orbital-angular-momentum coupled Bose-Einstein condensates on a ring 2026 Chin. Phys. B 35 060305
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